Today, when making a delivery for the restaurant I work for, a customer shoved and yelled at me because she didn't get any fries with her order. She didn't order any, which isn't unusual, considering we're a Chinese takeaway and don't even sell them. FML

Not just some people. Statistically a large part of humanity can't even read. In some places analphabetism rates are as high as 50%. Even in rich western countries it's not zero. Among those who can read a large percentage suffers from functional illiteracy. Which basically means a very significant portion of the human population either can't read at all or their reading/writing skills are at a childish level. And I'm not talking about 1 or 2%. I'm talking about something like 40-50% at least. In the US around 50% of the population could be functional illiterates(wikipedia). The remaining population isn't necessarily smart. Even if we suppose they are, your "it's just some people" is still invalid. Depending on your definition of characteristic, the statement "humanity is ignorant" could be considered true or false. Personally I consider a characteristic to be a feature shared by the majority of the things we're trying to describe. If you agree with my definition then humanity is certainly ignorant.